Thanks, I hadn't thought of that. It works fine, now.
I'll look out for that in the future.
Ken
Quoting Peter Ehlers :
Ken,
You just need to wrap the rhs of your formula in I() to
get around update()'s parsing of terms.
m2 <- update(m1, . ~
I(Rm * Contrast^ex/(Contrast^fx + si
Ken,
You just need to wrap the rhs of your formula in I() to
get around update()'s parsing of terms.
m2 <- update(m1, . ~
I(Rm * Contrast^ex/(Contrast^fx + sig^fx)),
start = list(Rm = 30, sig = 0.05, ex = 3,
fx = 3.1))
-Peter Ehlers
Ken Knoblauch wrote:
Hi,
I'm getting an error that I don't understand when updating an nls
object. Here is a toy example.
dd <- structure(list(Contrast = c(0.00376, 0.03759, 0.12782, 0.25564,
0.50376, 1), Response = c(0.29915, 6.13248, 29.01709, 30.0641,
29.46581, 27.67094)), .Names = c("Contrast", "Response"), cla
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